Final answer:
Enzo should either undo the theme change, select a new theme with a lighter background, or change the text color to contrast with the black background. This will make the text visible again and allow him to continue working on his presentation.
Step-by-step explanation:
Enzo was working on his presentation with the Themes menu open. He accidentally clicked on an all-black theme, and all of his text seemed to disappear. After an appropriate moment of panic, Enzo's best option is to change the theme back to one that allows for his text to be visible again or customize the current theme's text color to one that contrasts well with the black background, such as white or yellow.
He can revert the changes by either clicking the undo button, usually represented by an arrow pointing to the left, or by going back to the Themes menu and selecting a different theme with a lighter background that complements the text color. If Enzo wants to stick with the all-black theme, he would need to highlight the text and change its color manually to ensure it stands out against the background.
Such mishaps are common when working on presentations and can be easily fixed with a few clicks, ensuring that Enzo's work is not lost, and he can continue to prepare his presentation effectively.